I don't know what's going to happen, but here's what I'd like to see happen:

Everyone gets a number on their BP. Everyone.
1 for First and GS on the carpet
2 for Biz and 1K on the carpet
3 for 1P on the carpet
4 for 2P/3P
5 for remaining E+ and aft third of E-
6 for middle third of E-
7 for front third of E-

Elderly, families that "need a little extra time" board with their number group.

Put a giant "Now boarding group #" on the gate monitors.

Large aircraft boarding through dual jetways have one jetway for premium cabins and one jetway (with carpet and non-carpet lanes) for coach.